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Repair method of central positioning pin of nuclear fuel assembly

A nuclear fuel assembly, center positioning technology, applied in nuclear engineering, nuclear power generation, greenhouse gas reduction and other directions, can solve problems such as long time and complexity

Active Publication Date: 2018-09-25
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ensuring the centering of machining tools can be time-consuming and complex

Method used

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  • Repair method of central positioning pin of nuclear fuel assembly
  • Repair method of central positioning pin of nuclear fuel assembly
  • Repair method of central positioning pin of nuclear fuel assembly

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0039] Such as figure 1 As shown in , the repair method and assembly of the present invention are used to repair the centering pins of nuclear fuel assemblies attached to the plate 3 of the reactor.

[0040] Usually, the flat plate 3 is the top plate of the core. In this case, the positioning pin 1 is used to cooperate with the nozzle of the top socket of the nuclear fuel assembly.

[0041] As a variant, the flat plate is the support plate of the core. In this case, the positioning pin is used to cooperate with the nozzle of the bottom socket of the nuclear fuel assembly.

[0042] The flat plate 3 is a large-sized flat plate defined by a top surface 5 and a bottom surface 7 facing each other. Alignment pin 1 protrudes perpendicular to one of these planes, at figure 1 In the example of the large face 7 is reversed towards the bottom of the pool.

[0043] The positioning pins 1 are regularly distributed on the flat plate 3 at positions determined by the assembly of nuclear ...

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PUM

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Abstract

A maintenance method of a central positioning pin of a nuclear fuel assembly is provided. The method includes following steps of: disposing a processing tool (31) relative to the positioning pin (1), namely, radially centring the processing tool (31) relative to the central axis (X) of the positioning pin (1) while adopting the positioning pin (1) as a reference surface; and processing the positioning pin (1) by using the processing tool (31).

Description

technical field [0001] The present invention generally relates to the maintenance of dowels that allow the centering of nuclear fuel assemblies in the core of a nuclear reactor. Background technique [0002] The top plate of the PWR (Pressurized Water Reactor, Pressurized Water Reactor) type nuclear reactor core supports a plurality of center positioning pins located in the nozzle, and the nozzle is arranged in the top sleeve of the nuclear fuel assembly. The support plate of the core also includes locating pins, which are located in the nozzles of the bottom socket nozzles of the nuclear fuel assemblies. These dowels help lock the nuclear fuel assembly in place. [0003] When the alignment pin is pushed in or removed from the corresponding nozzle of the socket of the nuclear fuel assembly, friction may be generated between the outer surface of the alignment pin and the inner surface of the nozzle. In the long run, this can cause damage to the outer surface of the dowel, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C5/06
CPCG21C5/06G21C19/207Y02E30/30
Inventor 埃里克·曼尼维奥艾伦·斯卡维尼雷米·德高
Owner FRAMATOME ANP